According to the manual there should be an option to restart any level you are currently playing by going to the passport, but this option never shows up for me. I also do not have the option to replay any previously beaten levels from the title screen. I can only re load a save game. This is a little frustrating since I think I may need to start the level I am currenty on over again. Is anyone else having this problem?

None of the PC versions have a "restart level" function and the mention in the manual is a mistake; it's a good idea to always make a save at the start of every level in case you want to restart it.

If you're seemingly stuck on something I can probably give you a way out of it.